body {
  margin: 0;
  font-family: Arial, sans-serif;
  background-color: #f9f9f9;
}

/* 顶部导航栏 */
.top-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 15px;
  background-color: #fff;
  border-bottom: 1px solid #ddd;
}

.top-nav .icons {
  display: flex;
  gap: 10px;
}

/* 标签栏 */
.tab-bar {
  display: flex;
  justify-content: space-around;
  background-color: #fff;
  border-bottom: 1px solid #ddd;
  padding: 10px 0;
}

.tab-bar div {
  padding: 5px 15px;
  font-size: 16px;
  cursor: pointer;
}

.tab-bar .active {
  color: red;
  border-bottom: 2px solid red;
}

/* 内容区卡片 */
.content {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  padding: 15px;
}

.card {
  background-color: #fff;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.card img {
  width: 100%;
  height: 150px;
  object-fit: cover;
}

.card .info {
  padding: 10px;
}

.card .info p {
  margin: 0 0 5px;
  font-size: 14px;
  color: #333;
}

.card .info .use-button {
  display: inline-block;
  padding: 5px 10px;
  background-color: #f0f0f0;
  border-radius: 5px;
  font-size: 12px;
  cursor: pointer;
}

/* 底部导航栏 */
.bottom-nav {
  display: flex;
  justify-content: space-around;
  align-items: center;
  padding: 10px 0;
  background-color: #fff;
  border-top: 1px solid #ddd;
  position: fixed;
  bottom: 0;
  width: 100%;
}

.bottom-nav div {
  font-size: 14px;
  text-align: center;
  color: #666;
}

.bottom-nav .active {
  color: red;
}
